Pneumatic conveyer



June 9, 1925.

y G. BERNERT ET AL PNEUMATIC CONVEYER Filed June 5, 1921 ORNEY PatentedJune 9, 1925.

UNITED SATNT wonen BnRNEmi AND JACOB BERNEBT; OMILWAU'KEE, Weoonsr'n.

iei'iiinvieiiie .eeiweiiee eeeiieeee inea iii-ie' ree-i. 'seiiei lie.711346.

To'nZZ 'wm 'if f/'zng/ bonne/mg" VBe it known thzt We, G'G Bnlinvrancl'- JACOB BE'NRT both citizens" of the United Stetes, endgAeilfeiiis;` of Milwaukee, iiithe County of Mihv'anle :incl- Stette pfWi'eeeneiii, lieve' invented' iie'i'v end useful Impil'vements in vPneumatic] Cnjeyers; and We de hereby cleielzire th't lie following ieeviiill', eleeigeiiclj e; e6 deeeiiptieii tliere'ef. This inventionielfetee te eeteiii; iiew end useful improvement'sin pieni'ntioonife'y'- ers of that in lending' grain er other iiieteiiel infoelevators', eers end tli'e'l-i'lre.V v

ln* the present Vtype of pneumati'o Con- `t'e5'fer i considerablearndnnt of dli'st and other lighter pagitele aire rrsecl Vwhen themateriels are' tlchitrgetl into` the' hopper 'for Conveyance to theConveying" tir diret. Furnier-mere; there ie et' eli time-sj seme beekpressure in' theI` hopper ariel conveyed" Casing leediiig eher'efremivliie'ii interferes with; the feeding therethrongl of the mnterirle;vThis beek pi-eseiii-e eleoleellde te-.ilie dus@ r 'eed in the hopperincl Serves? to Ciren'lete the Seme tlireiigh eliie :itiiisphereeiiiffeulniirg.

the machine it highly' objectionable.

Hence' With the' whore other objections to penmzrtie eii'eyeis" of thetipe new generally employed rn minchit is one olo'jeot of this inventionto provrl'e menne communicating With the material for the' `air ductWhichti/ll overcome bfieli pressnre therein and prevent the cirirlati'onof the clust; chie' to Stich pre'sslire ii'cll to' the dieeharging of efresh Supply of mterifrls therein?.

It isanother ohjeet of' this invention to connect pipey with inlet f thepneumatieconw'fejfer blower' rime Wlielr pipe* has its other endconnected With the yfntt-erizil supply meet-ne; to' overcomeV bokpre'slsnre therein an'cl Carry off dst c'retedl isopreient itscirculationthieulgh nie'y 'surriiiidling mosph'ere'.

fr further object of the present invention is toprovide ai pneninttioVe'om`f`eye'r of the elzis'sl described in which the supply hopper isconnected with t'liemin oonveyer :wir duet find: hee en eiiclo'edozis'ingcoinnnnic'ting 50 4thereivitl'i inl provided with an peningtl'irou'gh which the' intri-l'ie siipplied, the uppj i pei-t eff theBeing. eniieeted with Siit'ioii means' t'o' ofveiyone beek 'pressure.therein eiid ceri-y' ff `ell diis't'tliet 55 'mail tend to cii ete'therefrom.

A een fiirtiieil# ebje'e'e ef this invention ie 'eea peevide e deviceefnie eiee-S @ieee-ieee which will not interielly inereiiee'the. eosltof the' machine@ sind which tvill perform its 60 function in a highlysatisfactory manner.

ll/*ith the' there and' other ohjeot's in'view Wl'i'i-Ch will apperes'th'e description proceecle, ori-i" invention residesin thefnov'e'lCon'stinotion, 'cmhinti'on :incl arrangement 65 ef pei-ejeeiibetentiellyr' es heieiiieft'eig de- 's {iiledj andl morepertio'iila-rly 'clefin'efljhy the eppended Claims, it being understoodthat sneh changes in the precise emlclnient of the herei'ndii'seleclinvention 70 be matie es Caine Within theeo'pe of the ,In the'zice'oinpnyiiig; driving,-

o' the principles thereof, and which :`-4

lllignre l ie' a siltle View of t pneu'rnzit-ic cenveyeij` einbedyiiigfour invention, part so thereofb'eing broken away' and in Section, enelFigurel Q sfzi fragmentary top plan View ilhistreting the man-ner ojfconnecting the materiel: supply meztns with' a su'eti'o'n means. 85

Referring now more partieularly to the accompanying drawing in whichlike nu# meraledesigirate like' parts throughout the sererzil views, itwill be seen that the improved" corn'ejfer comprises in its general 90orgnzation :t fun Casing' 5 h'wing a fan or blower 6 therein, in trunkbeing in coinmunicationi with the easing 5. The trunk 7 s'ljuiovideclwith an opening (not shown) with which a conveyer casing S isConiieete'cl, J5 the casing' hin/ing suitable co'iveying mea-nsmount-:ed therein' (not. shown) whichv are driven fromv n shaft 9lim/'ing a geen l() CIK fixed thereto and in mesh with a gear 11 mountedon a shaft 12 driven from the fan shaft 13 by a suitable chain or beltconnection 14. The shaft 13 has a pulley 15 mounted thereon which isconnected with a suitable source of power (not shown).

The lower or receiving end of the conveyer casing 8 is provided with ahopper 16 into which fits the lower end 17 of a casing 18 preferablyhaving a side opening 19 through which the materials, to be fed to thetrunk, or air duct 7, are discharged. Under normal conditions there isat all times a back pressure within the conveyer casing 8 due to itsconnection with the air duct 7 and consequently there is someinterference with the proper conveying of materials therethrough.Furthermore, when theY materials are discharged into the hopper 16, adust is given off which circulates through the surrounding atmosphereand is highly objectionable. rThis dust is aggravated by the backpressure and therefore we have provided means for overcoming the backpressure and to prevent circulation of the dust given off from thematerials.

The fan casing 5 is preferably provided with two alined central openings20, concentric with the shaft 13 which form the inlet for the airpropelled through the duct 7 by the fan or blower 6. One .of theopenings 2O has a pipe 21 connected therewith which leads to the hoppercasing 18 and is connected with the interior thereof at a point 22 nearthe top thereof whereby a suction will be maintained within the casing18 at all times to overcome the back pressure therein and to insure thecarrying off of all dust and lighter particles stirred up in thematerial supply.

It will be readily apparent that if desired, all of the air supplied tothe blower may be drawn through the pipe 21, o-r else 'through the pipe21 and a second opening 20. The dust or lighter particles given oi bythe materials due to their being discharged into the hopper or due tothe effect of the back pressure thereon are conveyed from the cas ing 18through the pipe 21 into the fan casving 5 from whence they are.impelled with the air through the duct 7 to be again commingled with thematerials discharged into the duct by the material supply.

F rom the foregoing description taken in connection with theaccompanying draw-ings, it will be readily apparent to those skilled inthe art to which an invention of this character appertains, that theobjectionableeifect of the baci; pressure in the material supply isovercome, the annoyance of having the dust circulated about the machineis relieved and in general the eiiiciency of the machine is4 materiallyincreased. 1t will also be appreciated that the present invention may beapplied either to pneumatic conveyers at the time of their manufactureor to the conveyers now in use.

That is claimed:

1. A pneumatic conveyer, comprising, in combination, a fan casing, a`conve-ying duct extended from the fan casing, a blower fan in the casingfor procuring a pressure of conveying current of air in the duct, airinlet means for the fan casing, an elongated conveyer casing havingadischarge and a receiving point, means connecting the conveyer casingdischarge point with the conveying duct ahead of the fan, mechanicalconveying mechanism within the conveyer casing and adapted to conveymaterial entering theJ conveyer casing at its receiving point throughthe casing to the conveying duct to be therethrough conveyed by theconveying current of air, and means conc rent of air therein, aplurality of air inlets for the blower fan, a` conveyer casingindependent of the blower fan and having its discharge end connectedwith the duct at a point outwardly of the blower fan, a material supplyhopper communicating wit-h the receiving end of the conveyery casing,means within said casing for conveying material from the hopper anddischarging the same into the conveying duct to be therein conveyed bythe conveying current of air, and a duct connecting one of the blowerfan air inlets wit-h the interior of the hopper, whereby any backpressure inthe hopper, incidental to its connection with the conveyingduct through the conveyer casing, is relieved and carried od through theblower fan.

8. A pneumatic conveyer, comprising, in combination, a fan casing, aconveying duct extended from the fan casing, a blower fan in the casingfor procuring a pressure of conveying current of air in the duct, airinlet means for the fan casing, an elongated conveyer casing having adischarge and a receiving point, means connecting the conveyer casingdischarge point with the conveying duct ahead of the fan, mechanicalconveying mechanism within the conveyer casing and adapted to conveymateria-l entering the conveyer casing at itsreceiving point through thecasing to the conveying ductto be therethrough conveyed by the conveyingcurrent of air, a receiving hopper lconnected with the receiving end ofthe conveyer duct and into which material to llO be conveyed through theconveying duct is discharged, the material fromjthe hopper entering theconveyer casing and ,therethrough conveyed and discherged'into theconveying duet, and ineens connecting the inlet ineens of the fan casingwith the interior of the hopper, whereby dust agitated by dischargingmaterial into the hopper and any back pressure in the oonveyer casingncidental to its connection with the oonvey- 10 lng duet 1s relieved andcarried o' through` the blower fan. v

In testimony that We Claim the foregoing We have hereunto set our handsat Milwaukee, in the county of Milwaukee and Stute 15

